<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" placeholder="员工姓名" id="i1">
<input type="text" placeholder="员工工资" id="i2">
<input type="text" placeholder="员工工作" id="i3">
<input type="button" value="添加" onclick="f()">
<table border="">
  <caption>员工列表</caption>
  <tr>
    <th>姓名</th>
    <th>工资</th>
    <th>工作</th>
  </tr>
</table>

<script>
let i1 = document.querySelector("#i1")
let i2 = document.querySelector("#i2")
let i3 = document.querySelector("#i3")
let t = document.querySelector("table")
function f() {
    let tr = document.createElement("tr");
    let nameTD = document.createElement("td");
    let salaryTD = document.createElement("td");
    let jobTD = document.createElement("td");
    nameTD.innerText = i1.value;
    salaryTD.innerText = i2.value;
    jobTD.innerText = i3.value;
    tr.append(nameTD, salaryTD, jobTD);
    t.append(tr);
}
</script>

</body>
</html>